Rock-drilling machine.



No. 887,801. l PATENTED MAY 19, 1908. H. HELLMAN & L. G. BAYLBS.

Romp-,BILLING MACHINE.

APPLICATION FILED JAN. 8,1907. 2 SHEETS SHBET 1' No. 887,801. I PATENTBD MAY 19, 1908.

` H. HELLMAN & L. G. BAYLBS.

ROCK DRILLING MACHINE.

Io Io H .s 19o. APPL AT N LED TAN 7 zsHEETs-SHEBT 2.

i therewith.

UNiTED STATES PATENT oEEioE.

ROCK-DRILLING -MACHINE.

Specification of Letters Patent.

Patented May 19, 1908,

Application filed January i3, 1907. Serial No. 351,340.

`ing` is a speciiication.

Thisin/ventrion relates .to rock-drilling machines oi" engines.

The present improvements consist of certain novel -features in the construction and arrangement of certain arts of Athe machine as`hereinaftervdescribec and pointed out in the appended claims..

The improvements have for their obj ect to simplify the constructionr and at the same time increase the efficiency of the machine.

The several im rovements will now be described by aid o the accompanying drawn ings, wherein lFigure 1 represents the machine and its attachments in longitudinal sectional part elevation. Y line r of Fig. 1. Fig. 3 is a transverse section on line yy-y oi Fig. 1. Fig. 4 is a front elevation of the water swivel detached. Fig. 5 is a section of Fig. 4 on line .e2- 22, with the hose stem or Spud in position therein. Fig. 6 is-a Jfront elevation of a modiiied form of the spring for securing the hose stein to the swivel, and Fig. 7 is a side elevation of 1 represents a tail pipe which is non-rotatably secured to the rear end of the power cylinder 2; 2a being the hammer piston. At the forward end the power cylinder 2 is provided with a hole 3 of poly'onal section-to receive the shank of the bit which is made of corresponding section, so that when the tail pipe 1 andpower cylinder 2 are rotated, said bit is compelled to rotate in. unison wheel 5.

6 is the crank or handle which is mounted round theratchet wheel 5, the latter being constiucted-round-the outside witha flange 7 serving as a stoplfor the handle 6. In. a recessS in the-handle is located a helic'al spring 9 and riding on the spring is a pawl 10. which is ada ted to en age the teeth of the ratchet-where 5. By this construction it is ppssible to? impart anintermittent rotary Fig. 2 is a transverse section onr Into the rear end of the tail pipe motion in 'one directionito the drilling bit through the power cylinder 2 and tail pipe 1 b rocking the handle 6 or by moving it part 027 a .revolution iirst in one direction and then in the other direction, thereby obviating the necessity for rotating the h'andle'in the operation of rotating the drill. Under certain circumstances this will be an advantage, as for example in the event of the machine b'eing so mounted that it would be impossible to turn the handle through a complete revolution owing to the machine being mounted near the rock o'r other obstruction. It will be ap arent that 'the pawl 10 is free to move roun the ratchet teeth in one direction without any rotary motion of the tail pipe 1 ensuing, while, when moved in the o posite direction, the ratchet wheel 5 and wit it`the f' the tail pipe 1, power cylinder 2 and bit in any desired position when it is out of operation, as for example when effecting the changing of the drills or bits, we provide in the gland 35, which serves for retaining packing in the sliding joint between the tail pipe and the back cap 22 of the protective casing 13, a conical screw-threaded hole Aand provide a correspondingly screwed coned. plug 37,

which as shown in Fig. 3 is split at 38. 39

are handles formed on the plug 37 for rotat-- ing it. The action, of rotating itin one direction screws it into the gland 35 and so tightens it round the tail pipe l and clamps the latter to the casingI 13. When the plug 37 is screwed in the opposite direction it er 'ands and then allows the tail pipe l to slide eely through it. The gland 35 is nonrotataby -secured to the `rear cap 220i the ,casingl For obtaining anfintermittent supply -oi water through the drill steel or boring bit to the cutting extremity-by means Aof the actu-V ating iiuid, we dispense with the .usual annu# lar recess between` the swivel '72l and iront., head 7 3 orpowercylinder 2 Whenztne swivel 'the spud of the hosestempgiTlie mont l head 73 (or power cylinder) is formed with one or more of the radial ports 76, which communicate with an annular space 77 formed round -the impact piece .69. The impact piece 69 is constructed with the axial ole 78v through which a quantity of the actuating .fluid mayy pass from the ower .cylinder 2, and with the two forward y inclined ports 7,9 communicating with saidl axial hole 78 at the forward end, or a recess 80`opening to the front of the impact piece '69. vFrom thislatter recess 80 the intel'- mittent supply of water and air asses to a longitudinal hole in the drill stee terminating at or in proximity to the cutting end.

By this `construction a quantity of the actuating fluid is free to pass along .the axial nally threaded hole in the nosepiece 81 are placed. a number of thin metal rings 82 which forml liners or washers between the nosep'iece and front head. The nosepiece 81 jams againstA the washers or liners 82. One or more of the'washers 82 are removed as may be necessary from time to time totake up wear between the; sides of the -water swivel72 and front head 73 and nosepiece 81. The hole 3 of olygonal cross section in which the bit A 1s loosely positioned, is 40 formed in the nose-piece'Sl. The bit projects through the center of the liners or washers 82 and at its inner end abuts the impact piece 69, which latter is struck by the hammer piston 2a. Thewater swivel 72 flange 83 formed' round the'front head 73 and the reary end 84 of the nose-piece 81. 85 are packings located between the water swivel 72and the shoulder 83 and nosepiece 81 respectively. With a machine constructed as shown the rotation is always to the right, accordingly the screw-threads on the power cylinder 2 for the front head 73 and on the front head forfthe-'nosepiece 81, are

right hand threads.

necessity for the use of any locking device, the tendency is, for the parts to screw up work tight and not to unscrew or Work loose. 1 .l y

. Forconnecting to the swivel 72 the water controlling valve'or the hose stem of the ipe which serves for conducting the water rom the valve tothe swivel, we provide, as shown in connection with Figs. 4 to 7 of the'drawings a split ring 48. 74h is the hole in the is positioned between an annular'shoulder or This obviates the spring 48 in which fits round the hose stein 96 beneath the Spud 75 and serves for keeping the latter in posit-ion in the coned recess in the water swivel 7 2. This hole 74b is formed-near one end of the spring and this end of the spring, as shown at 7,42L in Fig. 7, is increased somewhat in width to strengthen it. The extremities` 97 of the spring' are preferably curved outwards slightly to facili# tate the removal of the locking spring from the swivel. The other end of the spring opposite the hole 7 4l" is "fullered in or formed with an internal depression 97a and the water swivel 72 as shown in Figs. 4 and 5. is formed with a corresponding' groove 72el in which said depression 97 fits when the spring is in position round the swivel. This construction prevents lateral movement lof' the spring. i

The construction of the valve forcontrolling the admission of the water to the' swivel 72, consists of the valvebody or casing 93, 109 is the air supply inlet to said casing, 100 the water supply inlet to the casing', and 110 the water and air supply outlet from the casing to the swivel 7 2. 94, 101 and 107 are hose or other suitable fiexible pipes communicating with the several openings 110, 100 and 109 respectively, and 112 are clamps fixing said flexible pipes to their rigid tubuy.

lar connections with the valve body. 107 communicates with the main air inlet be tween the inlet in the casingback cap 22 andy throttle valve 53; The valve 93 is constructed on the one side with a flange 113 and to it, by means of the screws 114, is fixed a cover or end plate 115.' Between this cover 115 and the flange 113 of the body is'arranged and secured a flexible diaphragm 116 of rubber or other suitable material.

Inside the-body is located the valve comprising a cylindrical center portion 117 formed towards one end with an annular enlargement or flange 118. The extremity of the valve projects through ahole in the lcenter of the flexible diaphragm 116 and is 'secured thereto by means of a nut 119, 120

is a recess 1n the cover' for the nut 119 and -end-of the valve and to allow for movement of the valve, The body 93 is formed with a recess 121 slightly exceeding in diameter that of the flange 118 which is 'adapted to move backwards and forwards therein in the operation. of the valve. The other extremity of the valve is provided with a leather orother resilient' packing 122 adapted to seat on the valve face 123. 124 is a washer and 125 a nut for securing the packing 122. In the valve body 93 and concentrically disposed round the valve is a helical spring 1 26 which at one end bears against the valve body 93 and at the other end bears against' the flange 118. This spring 126 operates to keep the valve closed. The center piece 117 of the lvalve is reduced, and surrounding .it is a holsensor low cylindrical piece 127 of rubber or other suitable resilient. material. This rubber valve serves for closing avradial port 128 which communicates with an axial hole or Iport 129 opening into the recess l1Z0 in the iront of the air inlet 109. The air entering byj the pipe 107 exerts pressure on the flexible .diaphragm`116 and raises the valve 122 ofi itsseat 123 and allows water, which has entered the valve body 93 by the pipe 101, to pass into the chamber round the center ,portion 11T of the valve. At the same time a quantity of the compressed air or actuating lluid passes along the axial port 129, radial 15 port 128, and escapes through the rubber valve 127 to the chamber, from which it escapes along with the water by the pipe 94 to the swivel 72. It will be lapparent that' this construction of valve prevents the possibility of the water` passing out of the valve body along the air supply pipe to themachine.

IVhat we claim as our inventiony and desire to protect by Letters Patent is 1. In a rock drilling machine, in combination, a rotatable power cylinder, means for rotating said. cylinder, a reciprocal percussive member in the power cylinder, a front head screwed to the cylinder, a swivel piece surrounding the 'front head, means for con ducting water to said swivel, the front head having a passage placing the swivel in communication. with a longitudinal hole in the` bit, a nosepiece screwed to the front head and serving as a retaining device for the swivel, and a bit supported by and nonrotatable in the nosepiece. v2, In a rock drilling machine, in combination, ,a rotatable power cylinder, means for rotating said cylinder, a reciprocal percussive ,member in the power cylinder', a front head screwed to the cylinder, an impactv piece re-` ciprocal within the front head and adapted Itobe struck by the .reciprocal percussive l member, a swivel piece surrounding ,the front' head, means for conducting' vwater 'toV said swivel, the front head having a passage placing the swivel in communication with. a lon-A gitudinal hole in the bit, a nosepiece screwed to the'lront head and serving as a retaining device for the swivel, packings between the swivel, front head and nosepiece and washers or liners between the front head and nosepiece, and a bit having al longitudinal hole extending therethrough supported by and -non-rotatable in the nosepiece and abutting the impact piece, and the impact piece v,having passages leading from the power cylinder to the longitudinal hole in the bit. y 3. n a rock drilling machine, in combinay tion, a rotatable power cylinder, meansfor rotating said cylinder, a reciprocal ercussive member in the power cylinder, ,a iiont head screwed to the cylinder, a swivel piece sun rounding the `front head, means for conducting liquid to said swivel, means for attaching `said latter means to the swivel comprising a screwed to the cylinder, a swivel piece surrounding the front.head,vsaid piece being formed with aperipheral groove, means for conducting liquid to said swivel piece com- 80 prising a hose, and hose stem and --a split y lookin spring for attaching the hose stem to l the swivel piece, the spring having an internal` Y projectiony fittingthe peripheral groove in the swivel. g5

5. In a rock drilling machine, in combina, y tion, a rotatable power cylinder, means for rotating said cylinder, a reciprocal percussive member in the power cylinder, a front head screwed tothe cylinder, a swivel piece surrounding the front head, said piece being formed with a peripheral roove, and with an internal recess and recess or the hose stem in communication with the first mentioned recess, means for 'conducting liquid tosaid 95 swivel piece, said swivelpiece comprising a hose ,and hose stem, and a split locking sprin for attaching the hose stem to the swive piece, the spring having an internal projection fitting the peri heral-groove in 10()y the swivel, the front head aving apassage placing the swivel in communication -with the longitudinal hole in the bit, a nosepiece screwed to the front head and serving as a retaining'device 'for the swivel, packings be- 105` tween the nosepiece front head and swivel, and a bit non-rotatably supported by the nosepiece. y

6. In a rock ydrilling machine, in combination, a rotatable power cylinder, means for 1'10 rotating said cylinder, a reciprocal ercussive member in the power cylinder, a ont head screwed to the cylinder, a swivel piece surrounding the front head, means for conduct- Aing water to said swivel, means for auto-1115 matically shutting off the water supply when themachine is ut out of operation, and a bit supportedA and rotatable with the) power cylinder havin a passage extending therethrough"with` w ich' the .swivel piece 1,20 communicates.A

7. In a rQclr drill-ing machine, in combination, a rotatable phwer cylinderymeans for `rotating said cylinder, a reci rejcal ercussive member in the power cylin er, a ont head ,125 screwed ,to the cylinder,- a swivel piece suri rounding the front head, means for conducting water to said swivel, means. for "automatic-,all i shutting od the water supply when the mac ine' is putout of operation and com- 130 acted upon 'by the motive .fluid to operate thev valve to admit the water to the means leading to the swivcl,a11d a port controlled by a sep arate valve for allowing a quantity of thc actuating fluid to pass with the water to the swivelA while preventing' lthe passage -oi the water into the motive fiuid supply pipe, and a bit supported by and` rotatable with the power cylinder having a passage extending therethrough with which the swivel piece communicates.

ln a rock drilling machine, in combina tion, a rotatable power cylinder, means for rotating said cylinder, a reciprocal percussive member in the power cylinder, a iront head screwed to the cylinder, a swivel piece surrounding the front head, means for conducting liquid to the swivel, means for automatically shutting oit' the liquid supply when the machine is out of o eration, means for permitting a quantity oi the actuating fluid to pass from the cylinder through the drill bit and a drill bit having a longitudinal hole extending therethrough for conducting the liquid and actuating Huid to the hole being drilled, the drill bit being supported 'by and rotated through the medium of the power cylinder.

9; In a roch drilling machine, in combina:

,our hands in the4 tion, a rotatable power cylinder, means for rotating said cylinder, a reciprocal percussive member 1n the power cyhnder, a iront head screwed tothe cylinder, a swivel piece surrounding the front head, means for conducting water to said swivel', means lfor automatically shutting oil the water supply when the machine is put out of operation com prising a valve interposed in said conducting means, means placing the casing of said valve in communication with the main actuating fluid inlet, so that the valve is actuated to admit water tothe swivel when the actuat-v ing fluid is'passing into the power cylinder,

and means which permit a quantity of the vactuating luidto pass ,to the swivel with the water, while at the same time preventing the passage of the water to the main actuating iiuid inlet,and.a bit supported by and rotatable with the power cylinder having a passage extending therethrough with which the swivel piece communicates.

In witness whereofwe have Ahereunto set presence of two subscribing witnesses. l f

' nENRr'HELLMAN.

LEWIS CONDICT BAYLES. Witnesses: y CnAs. OVENDALE, FRED OVENDALE. 

